1. Department of Thoracic Surgery; Lung Clinic Merheim; University Medical Center Witten/Herdecke; Köln Germany
2. Department of Thoracic Surgery; Center for Surgery; Medical Center-University of Freiburg; Freiburg Germany
3. Center for Pathology; Medical Center-University of Freiburg; Freiburg Germany
4. Department of Medicine I; Center for Medicine, Medical Center-University of Freiburg; Freiburg Germany
5. Department of Pneumology; Center for Medicine, Medical Center-University of Freiburg; Freiburg Germany